Patent GB-405718-A (GB)
Title: Improvements in or relating to means for applying adhesive to book signatures or thelike in book-stitching machines
IPC: B42B2/02
Filed: 1932-08-22
Abstract: 405,718. Sewing-machines. POLLAK, J. E., 20, Holbo n, London.-(Brehmer, Geb. ; Plagwitz, Leipsic, Germany.) Aug. 22, 1932, No. 23471. [Class 112.] In a book-stitching machine the stripper-bar is adapted to apply adhesive to a stitched book signature contacted thereby, either the normal work-engaging edge or face of the bar, or another edge or face disposed angularly thereto being brought alternately into contact with the source of adhesive and then with the stitched signature. Adhesive may be applied to any selected signature, but is preferably applied to the first and last signatures of each book. The machine, includes the usual swinging stitching saddle S, Fig. 3, which serves to position the signatures P for stitching beneath threadstitching needles (not shown). The stripper-bar 17, Figs. 3 and 6, comprises as usual a bar of rectangular section supported by two rocking- arms 25 pivotally suspended from two short bearing shafts 27, and is oscillated to and from the signatures in timed relation to the movement of the saddle S to contact each signature adjacent its fold edge to strip it from the saddle when the latter is withdrawn ; by the pressure of the bar 17 the pad of signatures is advanced along a support or trough T to the extent of the thickness of one signature. Each shaft 27 has a rotatable sleeve 27<a> thereon having attached or integral therewith one of the arms 25 and a crank lever 26, the latter being connected by a pitman 28 with one arm 29 of a pivotally-mounted bell-crank lever. The other end 29<a> of each lever 29 is engaged in one of a pair of cam-grooved discs 30 secured to a shaft 4, Fig. 1, driven in known manner to make one complete revolution for each signature stitched, and for each rotation of the discs 30 reciprocatory swinging movement is imparted to the stripper-bar 17. The bar 17 is provided at its extremities with trunnions 17<a>, Fig. 6, which are journalled in adjustable manner in sleeves 18 carried by the arms 25, one trunnion having secured thereon a gear-wheel 16. A stub-shaft 9<a> mounted above the bar 17 has secured thereto a gear-wheel 13 which is in mesh with another wheel 14 secured to a stubshaft 14<a>. The shaft 14<a> carries a second gear-wheel 15 which gears with the wheel 16 on the trunnion of the bar 17 when the latter is in the retracted or adhesive-receiving position. The stub-shaft 9<a> has secured thereto a ratchet wheel 9 adapted to be rotated by the engagement of a loosely pivoted pawl 10 on the end of a lever 11 pivoted on the shaft 9<a>. The lever 11 is linked by a pitman 8 of adjustable length to one arm 6 of a pivotally mounted bell-crank lever, the other arm 6<a> of the bellcrank lever carrying a cam follower 7 which is held under spring pressure in contact with a cam disc 3. The disc 3 is secured on a stubshaft 4<a> driven from the driving shaft 4 through a gear train g so proportioned that in one revolution of the shaft 4, and consequently the disc 30, the shaft 4<a> and cam 3 rotate through one fifth of a revolution. The cam 3 is shown as having four spaced rises 5<a> .. 5d and a dwell 54, the centre lines of which are evenly spaced so that adhesive is applied to the first signature and the last but one signature of each book. Each rise effects rotation of the gear-wheel 16, and thus the stripper-bar 17, through 180‹. The shaft 4<a> is divided by the interposition of a one-revolution clutch 2 adapted to be decoupled by a finger 2<a> carried by a slide member actuated by a foot pedal. To permit rotary adjustment of the stripper-bar 17 one of the bearing sleeves 18, Figs. 6 and 7, is reduced in diameter at 19 to receive a split bearing collar 20 formed with an annular flange 22, in the outer face of which are two recesses 22a set, in the example shown, at 180‹ apart to register the bar 17 in either of the two positions to which it is rotated. The trunnion 17<a> to which the gear-wheel 16 is keyed is freely rotatable in the bearing 18 while the bar 17 is provided with a spring-pressed ball 23 adapted to enter the recesses 22<a> when in register therewith. To adjust the operative positions of the bar 17 relative to the fixed position of the bearing 18 the collar 20 is released rotated to the requisite extent, and again clamped. The bar 17 is rectangular in cross-section, the edge 31 forming the normal signature engaging edge, while the opposite side 32 is provided with an adhesive-applying tongue 34. A laterally projecting edge 33 engages the side of the signature, as the saddle S retreats, in advance of the tongue 34 so that the latter is applied only to the selected portion of the signature. The adhesive is received by the tongue 34 from a roller 35 which is in contact with a supply roller 37 rotatably mounted in a container 36 and provided with a scraper 52. The supply roller 37 is geared to the roller 35 and to a stub-shaft which is rotated intermittently by pawl and ratchet gearing from one of the oscillating arms 26. Discs 47 are mounted on the trunnions 17<a> of the bar 17 to engage the roller 35, and each disc is provided with a concave recess 48 as shown in Fig. 7 so that only the tongue 34 of the bar 17 can engage the roller 35. The rollers 35, 37 and the scraper 52 are mounted in a frame 49 carried in guides 50 on the container 36, so that the frame 49 and its members can be readily removed as a unit from the container. The spindle of the supply roller 37 is journalled in slotted bearings and is shaped at its end to form a quick release coupling 53, Fig. 1, from its pawl and ratchet drive. The operation of the machine is as follows :- Assuming that the stitching of the book is at a point where the apparatus is about to be actuated to apply adhesive to the fold edge of the last but one signature of a book, the cam rise 5<a> has just passed the cam follower 7 thereby rocking the bar 17 about its axis so that the tongue 34 is set to face the fold edge of the signature. Then the bar 17 is rocked from the cam-grooved discs 30 about the pivot 27 to contact the signature as the saddle S swings away, and by the continued rotation of the discs 30 the bar 17 is restored to its retracted position with the tongue 34 lying at 180‹ away from the roller 35. In the next operative cycle of the machine the cam disc 3 is again stepped round through one-fifth of its periphery and the rise 5b passes beneath the follower 7 to effect a further 180‹ rotation of the bar 17 to bring the edge 31 to face the last signature, and when the latter is stitched the edge 31 is swung into contact with it in the normal manner. The dwell 54 of the cam disc 3 now engages the follower 7 and no further rotation of the bar 17 is effected during the next stitching cycle which effects an idle stitch between the completely stitched book and the first signature of the succeeding book. During the next working cycle, wherein the first signature of the next book is stitched, the rise 5<c> of the disc 3 operates on the follower 7, the stripper bar 17 is rotated to bring the tongue 34 to face the signature, and the discs 30 operate the bar 17 to apply adhesive to the signature. The rise 5d next operates to rotate the bar 17 to present the normal clean face 31 to the signatures, and, providing the foot pedal is not depressed, the clutch 2 will throw out of action the mechanism for rotating the bar 17. The clean face 31 of the bar 17 will contact with each signature now stitched until the clutch 2 is again thrown into engagement by depressing the foot pedal. In a modification the rotary action of the bar 17 is effected by mounting an arcuate rack or toothed segment on one of the shafts or pivots 27 about which the arms 25 and bar 17 are rocked, and the gear-wheel 16 on the bar 17 is adapted to mesh with the rack. The rack may be locked (by means not shown) so as to move with the lever 25 and bar 17, or may be released so that relative movement takes place between the rack and the gear-wheel 16 whereupon the bar 17 is rotated about its axis. In a further modification the adhesive transfer roller is dispensed with and the bar 17 contacts the adhesive supply roller which is mounted so as to form together with scraper the bottom of the adhesive container. The container is adjustably supported in guides, and the scraper can also be adjusted. A counting-mechanism may be incorporated in the machine to control the actuation of the adhesive - applying mechanism.